code: def create_req_from_text(text: str):
      req = DataRequest()
      da = DocumentArray()
      da.append(Document(text=text, tags={"key": 4}))
      req.data.docs = da
      return req
  
imports: import asyncio
  import copy
  from collections import defaultdict
  from typing import List
  import pytest
  from docarray import Document, DocumentArray
  from jina.serve.runtimes.gateway.graph.topology_graph import TopologyGraph
  from jina.types.request import Request
  from jina.types.request.data import DataRequest
label_desc: Use image node_id 15 for calling a global function with example usage: create_req_from_text(text) and returns: req